2020

Record high extraction efficiency of free electron laser oscillator
H. Zen, H. Ohgaki, and R. Hajima, Applied Physics Express, 13, 102007 (2020).

High-extraction-efficiency operation of a midinfrared free electron laser enabled by dynamic cavity desynchronization
H. Zen, H. Ohgaki, and R. Hajima, Physical Review Accelerators and Beams, 23, 070701 (2020).

Cellulose Degradation by Infrared Free Electron Laser
T. Kawasaki, T. Sakai, H. Zen, Y. Sumitomo, K. Nogami, K. Hayakawa, T. Yaji, T. Ohta, K. Tsukiyama, and Y. Hayakawa, Energy & Fuels 34, pp.9064-9068 (2020).

Demonstration of Variable Polarized Coherent Terahertz Source
S. Kashiwagi, H. Saito, F. Hinode, Y. Ishizuki, K. Kanomata, S. Miura, N. Morita, T. Muto, I. Nagasawa, K. Nanbu, K. Shibata, K. Takahashi, K. Terada, H. Yamada, H. Hama, H. Zen, and A. Irizawa, Infrared Physics & Technology, 106, 103274 (2020).

HgCdTe Detector Saturation Using Infrared Free Electron Laser and Infrared Synchrotron Radiation
Y. Ikemoto and H. Zen, Infrared Physics & Technology 106 103268 (2020).

Two-photon Selective Excitation of Phonon-mode in Diamond Using Mid-Infrared Free-Electron Laser
O. Sato, K. Yoshida, H. Zen, K. Hachiya, T. Goto, T. Sagawa and H. Ohgaki, Physics Letters A 384, 126223 (2020).